A9 paper size in cm

What is A9 paper size in cm ?

A9 size in cm is 3.7x5.2

The aspect ratio of an A9 paper is 1:1.41,The area of an A9 paper is 1924 mm², Perimeter of an A9 paper is 178 mm or 17.8 cm, Diagonal line of an A9 paper is 63.82 mm or 6.382 cm

Centimeter is a unit of length measurement, equal to one hundredth of a meter, the English symbol that is abbreviated as: cm., 1 cm = 1/100 m. 1cm = 10mm = 0.1dm = 0.01m